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|Oracle Solaris Administration: Network Services Oracle Solaris 11 Information Library|
The Oracle Solaris 11 release includes a new NFS feature called NFS referrals. NFS referrals are a way for an NFSv4 server to point to file systems located on other NFSv4 servers, as a way of connecting multiple NFSv4 servers into a uniform namespace.
NFSv2, NFSv3 and other clients can follow a referral because it appears to them to be a symbolic link.
NFS referrals are useful when you want to create what appears to be a single set of filenames across multiple servers, and you prefer not to use autofs to do this. Note that only NFSv4 servers may be used, and that the servers must be running the Oracle Solaris 11 release or later to host a referral.
An NFS referral is created using the nfsref command. When a referral is created, if the mount point does not exist yet, a symbolic link is generated which includes a special flag which identifies object as a reparse point. If the reparse point already exists, NFS service data will be added or will replace existing NFS service data, as appropriate.
An NFS referral is also removed using the nfsref command. It will remove NFS service data from the specified reparse point, and will remove the reparse point if there are no other types of service data present.